See Gem As
Tools
Research
Screening of Mounted Melee Using the GIA iD100
GIA’s new screening device accurately identifies an HPHT-grown melee diamond.
Revolution in Diamond Cutting: Laser Sawing of Diamond Crystals
This article describes the components and operation of the laser saw and its usefulness in diamond cutting.
A Report on the New Watermeyer Split-Facet Diamond Cuts
Introducing a new technique in diamond cutting that virtually eliminates the
Unusual Dumbbell-Like Inclusion in Diamond
Examination of a 0.40 ct near-colorless round brilliant diamond with a large inclusion resembling a dumbbell
Observations on GE-Processed Diamonds: A Photographic Record
Observations made at GIA on 858 GE-processed diamonds revealed several interesting features that may be diagnostic of this kind of diamond. Specifically, a significant percentage exhibited a slightly hazy appearance, noticeable internal graining, and other unusual internal features.
Two Near-Colorless General Electric Type-IIA Synthetic Diamond Crystals
Gemological examination of two near-colorless, isotopically pure, carbon-12 synthetic diamonds grown recently by General Electric reveals short-wave ultraviolet luminescence behavior, a cathodoluminescence pattern, and small metallic inclusions that are typical of other gem-quality synthetic diamonds.
An Update on Filled Diamonds: Identification and Durability
This report focuses on recent products from Yehuda/Diascience, Koss & Schecter Diamonds (Genesis II), and Clarity Enhanced Diamond House (a subsidiary of Goldman Oved Diamond Co.).
Natural Diamond with Unusual Phosphorescence
A rare observation of spatially distinct red and greenish blue phosphorescence in a natural diamond.
Natural Type IIa Diamond with Unusual Red Fluorescence Distribution
Breyite in Diamond
Iridescent Inclusion in Brown Diamond
An iridescent crystal with a stress halo is observed in a light brown diamond.
Natural Diamond with Twinning Wisps Resembling a Whale
Examination of a round brilliant diamond reveals twinning wisps in the formation of a whale.
